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| author | Eric Anholt <eric@anholt.net> | 2016-03-15 18:32:19 -0700 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2016-09-28 08:31:14 -0700 |
| commit | 1aa8a0392f256a1be8f8d2774a4f7d3e03b3aac3 (patch) | |
| tree | 37252635af501f6e59a0764117d4c73a30a34b30 /src/compiler/nir/nir_opt_constant_folding.c | |
| parent | 8d8c440ebf1a41dd235a67f3f1538cf47adec013 (diff) | |
| download | external_mesa3d-1aa8a0392f256a1be8f8d2774a4f7d3e03b3aac3.zip external_mesa3d-1aa8a0392f256a1be8f8d2774a4f7d3e03b3aac3.tar.gz external_mesa3d-1aa8a0392f256a1be8f8d2774a4f7d3e03b3aac3.tar.bz2 | |
nir: Optimize out discard_ifs with a constant 0 argument.
I found this in a shader that was doing an alpha test when alpha is fixed
at 1.0.
v2: Rebase on master (now the const value is "u32" not "u").
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> (v1)
Diffstat (limited to 'src/compiler/nir/nir_opt_constant_folding.c')
| -rw-r--r-- | src/compiler/nir/nir_opt_constant_folding.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_constant_folding.c b/src/compiler/nir/nir_opt_constant_folding.c index 8f04061..d6be807 100644 --- a/src/compiler/nir/nir_opt_constant_folding.c +++ b/src/compiler/nir/nir_opt_constant_folding.c @@ -155,6 +155,14 @@ constant_fold_intrinsic_instr(nir_intrinsic_instr *instr) progress |= constant_fold_deref(&instr->instr, instr->variables[i]); } + if (instr->intrinsic == nir_intrinsic_discard_if) { + nir_const_value *src_val = nir_src_as_const_value(instr->src[0]); + if (src_val && src_val->u32[0] == 0) { + nir_instr_remove(&instr->instr); + progress = true; + } + } + return progress; } |